The decline of agricultural economies
The Louisiana Purchase eventually doubled the size of the United States, greatly strengthened the country materially and strategically, provided a powerful impetus to westward expansion.
The answer should be D, Doubled the size of the country
Answer:
As a result of the westward expansion, there were many conflicts with the Native Americans. ... With westward expansion, more states entered the Union. This led to fierce debates about the spread of slavery to these new lands. This eventually became a factor leading to the Civil War
Explanation:
Thats the answer i want brainliest
Answer:
have fallen by more than one-half.
Explanation:
Thick, noticeable smog in many of the cities and manufacturing centers of the United States helped bring the 1970 e Clean Air Act to spur passage at the height of the national environmental movement. The ensuing modifications were intended to enhance its effectiveness and address newly recognized problems of air pollution such as acid rain and stratospheric ozone layer damage. The Clean Air Act allows EPA to set national environmental air quality levels for certain specific and prevalent contaminants, based on the latest research, to protect public health and welfare nationally. Certain main regulations are intended to reduce the rise in emissions from increasing motor vehicle numbers and new manufacturing plants.
The Space Race was the name given
